High-draft system of drawing cotton



July 14, 1925. 1,545,803

P. G. VANNI HIGH DRAFT SYSTEM OF DRAWING COTTON Filiid Seb't 25 1922 Patented July 14, 1925.

- of spinnlng machines which terial, and a UNITED STATES PATENT OFFICE.

PIER GIORGIO VANNI, OF MIL AN, ITALY.

HIGH-DRAFT SYSTEM OF DRAWING COTTON.

Application filed September 25, 1922. Serial No. 590,418.

To all whom it may concern:

Be it known that I, PInn GIORGIO VANNI, subject of the King of Italy, residing at Milan, Kingdom of Italy, have invented certain new and useful Improvements in High-Draft Systems of Drawing Cotton, of which the following is a specification.

The present invention relates to theparts are employed for drawing the textile fibers and has for its object a high draft system which may also be applied to spinning frames already in use.

The invention resides in the provision of a mechanism insuring a close and prolonged contact between a large proportion of the fibers contained in the sliver or similar ma portion of the surface of a retaining cylinder and of a leather belt, so as to maintain the pull upon the fibers during the drawing operation.

The arrangement according to the present invention comprises a belt of leather or any other suitable material encircling two rollers or cylinders which either by their own weight or through some supplementary pressure, keep the belt stretched and in close contact with the retaining cylinder.

The roller which is beyond the drawing zone may, either by its own weight, or aided by an additional weight, cause the belt to adhere directly to the retaining cylinder in order. to better assure the movement of the fibers, while the other roller by its own weight will stretch the said belt over the contact zone of the retaining cylinder. The

latter roller ma be formed without journals and is prefera I provided with suitable belt raised from the draw mg cylinder at the point where the fibers leave the cylinder in order to prevent a direct action due to the weight of the roller. A third roller may be introduced above the first two, in order. to obtain a more officacious tension and to guide the belt.

In order to make possible the application of this system to existing spinning-frames,

supports or movable oke members provided with grooves adapted to receive the 'ournals of the rollers may be disposed on t e arms of the said frames.

Various embodiments of the present invention are illustrated diagrammatically in F the accompanying drawings, in which:

Figure 1 is a sectional side view showing a leather belt stretched over a retaining cylinder, l

Fig. 2 is a partial plan view thereof, Fig. 3 is a sectional side view of another embodiment,

Fig. 4 is a plan view of Fig. 3,

ig. 5 is a sectional yiew showing an arrapgement for stretching and guiding the Fig. 6 is a plan view of Fig. 5,

Fig. 7 is a sectional side view of still another embodiment,

Fig. 8 is a plan View of Fig. 7,

Fig. 9 is a front view of a support to be secured to the arms of the spinning frame. Fig. 10 is a sectional side view thereof,

gig. 11 is a front view of a yoke member, an

Fig. 12 is a sectional sirle view of Fig. 11.

In the arrangement shown in Figs. 1 and 2, the two rollers 1 and 2 stretch the which passes around them, and press it toward the intermediate retaining cylinder 5 so that a portion of the surface of the lat-- ter is thus covered by the belt. It is precisely in this zone that the regulation of the' mo ement of the fibers is obtained, the slowly-advancing mass of fibers being pressed lightly against the cylinder by the lower stretch of the belt so as to be braked and compacted by said cylinder. A suitable drawing cylinder 6 is located immediately in advance of the cylinder (in the direction of travel of the mass of fibers) in position to seize from the entire of the greatest length, which are the ones that should be forced to move in order, to constitute the desired standard, and deliver them from the machine. Ordinarily, the engagement of these fibers would entail the movement with them of the shorter fibers; but due to the action of the belt 4, which presses them against the retaining'cylinder mass of fibers those belt 4,

5, the shorter fibers will be retarded orbraked without, however, interfering with the movement of the longer fibers, until in due course their ends reach the drawing cylinder.

Figs. 3 and 4 show a particular application of this arrangement. Against the intermediate drawing or retaining cylinder 5 there is mounted the roller 1' which isheld in position by the arms of the frame, due to the engagement of the journals of said rollor therein. The d uble e t 4 passes around said roller and the roller 2'; the latter roller being carried solely by said belt and having no other journals, though it may be provided with rims so that the belt will be suitably raised toward the forward part thereof in order to prevent any direct pressure, due to the component of its own weight, upon the retaining cylinder, where the movements of the fibers vary. These rims also serve as guides for the belt, which otherwise could vary. The front drawing cylinder 6 acts as before.

Figs. 5 and 6 illustrate the addition of a third roller 3 which presses against the other two rollers 1 and 2 and thus assists the same in stretching the belt 4?. The said roller 3 may be provided with rims in order to prevent lateral movement of the belt, and in such event the rims on the other rollers can be omitted. The intermediate retaining cylinder is indicated at 5 A roller 7 provided with journals may bemounted between the stretches of the belt 4 instead of above the same, as shown in Figs. 7 and 8, to hold the rollers 1 and 2 in correct position; the intermediate retaining cylinder being indicated at 5 Figs. 9 and 10 show a supporting means which permits the application of the invention to existing spinning frames. A bar 10 connects two plates 11 provided with projecting lugs 12 adapted to engage in the grooves 13 already existing in the arms of the machine frame; the journals of the rollers 1 and 2 being held in position by the edges of these plates. The third roller is indicated at 3*, the belt at 4, and the intermediate retaining cylinder at 5".-

Figs. 11 and 12 show a further method of obtaining the same end. Over the arms of the machine are fitted yoke-like members 16 having their branches formed with grooves 14 to receive the journals. rollers are indicated at 4 1 and 2 and the intermediate retaining cylinder at 5 I claim as my invention:

1. In a spinning machine, a drawing mechanism comprising a retaining cylinder, a pair of rollers, each of which is free to rise, located immediately above and adja- The belt and its cent to the cylinder, and a belt passing around said rollers and adapted to slowly advance the mass of fibers and to press them lightly against said cylinder to be braked and compacted thereby, said belt being stretched and guided during its movement; and a front drawing cylinder arranged immediately in advance of said mechanism in position to seize some of the fibers from said mass and deliver them from the machine.

2. In a spinning machine, a drawing mechanism comprising a retaining cylinder, a pair of rollers, each of which is free to rise and one of which has its ends free of journal above and adjacent to the cylinder, and a belt passing around said rollers and adapted to slowly advance the mass of fibers and to prew them lightly against said cylinder to be braked and compacted thereby, said belt being stretched and guided during its movement; and a front drawing cylinder arranged immediately in advance of said mechanism in position to seize some of the fibers from said mass and deliver them from. the machine.

3. In a spinning machine, a drawin mechanism comprising a cylinder a pair 0% rollers, each of which is free to rise, located adjacent the cylinder; and a belt passing around said rollers and adapted to press the fibers lightly against said cylinder, one of said rollers having u'njournaled ends and being carried by the belt so as to exert a stretching action thereon.

4. In a spinning machine, a drawing mechanism comprising a cylinder a pair of rollers, each of which is free to rise, located adjacent the cylinder; a belt passing around said rollers and adapted to press the fibers lightly against said cylinder, one of said rollers having unjournaled ends and being carried by the belt so as to exert a stretching action thereon; and a supplemen- .tal roller bearing upon the belt-carried roller and provided with rims for guiding the belt. In testimony whereof I afiix my signature.

PIER GIORGIO VANNI. Y

mounting, -located immediately 

